Engine Maintenance 9-10
ELC cannot be used in older units. The water pump seal bellows and O-rings used on older units are not compatible with ELC.
To upgrade new production engines for ELC use, all water pump seal bellows were changed from NBR to HNBR elastomer, and
the O-rings upgraded from NBR to EPDM elastomer. These changes were made as of the following engine serial numbers:
• TK 486, S/N, L16553 and after
• TK 482, S/N, A05679 and after
Units with these engine serial numbers and after can be changed over to ELC coolant. The cooling system must be flushed until
all traces of green or blue-green coolant dye are gone, and the discharge fluid (water) is clear. The system can then be filled with
extended life coolant (ELC).
Checking the Antifreeze
Check the solution concentration by using a temperature compensated antifreeze hydrometer or a refractometer designed for
testing antifreeze. Maintain a minimum of 50 percent permanent type antifreeze concentrate and 50 percent water solution to
provide protection to -34.0 C. Do not mix antifreeze stronger than 68 percent permanent type coolant concentrate and 32 percent
water for use in extreme temperatures.
Changing the Antifreeze
1. Operate the engine until it is up to operating temperature. Then stop the unit.
2. Open the engine block drain and completely drain coolant. Observe coolant colour. If the coolant is dirty, proceed with a, b,
and c. Otherwise go to step 3.
WARNING: Avoid direct contact with hot coolant.
a. Pour clear water into radiator and allow it to drain out of the block until it is clear.
b.Close the block drain and install a commercially available radiator and block flushing agent. Operate the unit in accordance
with instructions of the flushing agent manufacturer.
c. Open the engine block drain to drain water and flushing solution.
3. Pour clear water into the radiator. Allow it to drain out of the block (and accumulator) until it is clear.
4. Inspect all the hoses for deterioration and the hose clamp for tightness. Replace if necessary.
5. Loosen the water pump belt. Check the water pump bearing for looseness and retighten the belt.
6. Inspect the radiator cap. Replace the cap if the gasket shows any signs of deterioration.
7. Mix 4 litres of permanent type antifreeze and 4 litres clean water in a container to make a 50/50 mixture. (Do not add
antifreeze and then add water to the unit. This procedure may not give a true 50/50 mixture because the exact cooling system
capacity may not always be known.)
8. Close all drains and refill the radiator with the 50/50 antifreeze mixture. Make sure all air is bled from the cooling system.
Bleeding Air from the Cooling System
SL, SLX, SLXe, SLXi Spectrum
Jiggle pin thermostats are original equipment on units that have TK 482, TK 486 or TK 486V engines. Jiggle pin thermostats
make it unnecessary to bleed the air out of the engine block because they keep air from being trapped in the engine block.
Normally approximately 7.6 litres of coolant will drain from the cooling system. If only 4 litres of coolant seem to fill the cooling
system after it has been drained, air has been trapped in the block. Bleed the air out of the block using the following procedure:
CAUTION: IF YOU SUSPECT THAT AIR IS TRAPPED IN THE BLOCK, DO NOT START THE ENGINE WITHOUT
BLEEDING THE AIR OUT OF THE BLOCK.
NOTE: If an engine operates with air trapped in the block, the engine may be damaged. The high water temperature switch
may not protect an engine that has air trapped in the block.
1. Before pouring coolant into the cooling system:
• TK 482, TK 486 or TK 486V Engine: Loosen the plug on the back of the water pump.
2. Slowly pour coolant into the system until coolant comes out of the bypass hose (or plug) fitting.
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